Interchanged RHS substitution and test for PHI node.
Interchanged RHS substitution and test for PHI node.

vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL